diff --git a/packages/accounts/jest.config.js b/packages/accounts/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/accounts/jest.config.js
+++ b/packages/accounts/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/biometric-ed25519/jest.config.js b/packages/biometric-ed25519/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/biometric-ed25519/jest.config.js
+++ b/packages/biometric-ed25519/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/crypto/jest.config.js b/packages/crypto/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/crypto/jest.config.js
+++ b/packages/crypto/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/keystores-browser/jest.config.js b/packages/keystores-browser/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/keystores-browser/jest.config.js
+++ b/packages/keystores-browser/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/keystores-node/jest.config.js b/packages/keystores-node/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/keystores-node/jest.config.js
+++ b/packages/keystores-node/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/keystores/jest.config.js b/packages/keystores/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/keystores/jest.config.js
+++ b/packages/keystores/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/providers/jest.config.js b/packages/providers/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/providers/jest.config.js
+++ b/packages/providers/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/signers/jest.config.js b/packages/signers/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/signers/jest.config.js
+++ b/packages/signers/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/transactions/jest.config.js b/packages/transactions/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/transactions/jest.config.js
+++ b/packages/transactions/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",
diff --git a/packages/utils/jest.config.js b/packages/utils/jest.config.js
index 16a443e22e..0303334026 100644
--- a/packages/utils/jest.config.js
+++ b/packages/utils/jest.config.js
@@ -4,7 +4,7 @@ module.exports = {
     projects: [
         {
             displayName: "dom",
-            testEnvironment: "jsdom",
+            testEnvironment: "jsdom", // runs tests in a browser-like environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.dom.js?(x)",
@@ -12,7 +12,7 @@ module.exports = {
         },
         {
             displayName: "node",
-            testEnvironment: "node",
+            testEnvironment: "node", // runs tests in a Node.js environment
             testMatch: [
                 "**/test/**/*.test.js?(x)",
                 "**/test/**/*.test.node.js?(x)",